<template>
  <div class="slide-show" @mouseover="clearInv" @mouseout="runInv">
    <div class="slide-img">
      <a :href="slides[nowIndex].href">
        <transition name="slide-trans">
          <img v-if="isShow" :src="slides[nowIndex].src">
        </transition>
        <transition name="slide-trans-old">
          <img v-if="!isShow" :src="slides[nowIndex].src">
        </transition>
      </a>
    </div>
    <h2>{{slides[nowIndex].title}}</h2>
    <ul class="slide-pages">
      <li @click="goto(prevIndex)">&lt;</li>
      <li
        v-for="(item, index) in slides"
        @click="goto(index)"
        :class="{'active':index === nowIndex}"
      >
        <a :class="{'on':index===nowIndex}">{{index + 1}}</a>
      </li>
      <li @click="goto(nextIndex)">&gt;</li>
    </ul>
  </div>
</template>

<script>
export default {
  props: {
    slides: {
      type: Array,
      default: []
    },
    inv: {
      type : Number,
      default:1000
    }
  },
  data () {
    return {
      nowIndex: 0,
      invId: null,
      isShow:true
    }
  },
  computed: {
    prevIndex(){
      if(this.nowIndex === 0){
        return this.slides.length - 1
      }else{
        return this.nowIndex - 1
      }
    },
    nextIndex(){
      if(this.nowIndex === this.slides.length - 1){
        return 0
      }else{
        return this.nowIndex + 1
      }
    }
  },
  methods:{
    goto(index){
      this.isShow = false
      setTimeout(() => {
        this.isShow = true
        this.nowIndex = index
        this.$emit('onchange',index)
      },10)
    },
    runInv(){
      this.invId = setInterval(() => {
        this.goto(this.nextIndex)
      },this.inv)
    },
    clearInv(){
      clearInterval(this.invId)
    }
  },
  mounted () {
    this.runInv()
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
  .slide-trans-enter-active {
    transition: all .5s;
  }
  .slide-trans-enter {
    opacity: 1;
  }
  .slide-trans-old-leave-active {
    transition: all .5s;
    opacity: 0;
  }
  .slide-show {
    position: relative;
    margin: 15px 15px 15px 0;
    width: 900px;
    height: 500px;
    overflow: hidden;
  }
  .slide-show h2 {
    position: absolute;
    width: 100%;
    height: 100%;
    color: #fff;
    background: #000;
    opacity: .5;
    bottom: 0;
    height: 30px;
    text-align: left;
    padding-left: 15px;
  }
  .slide-img {
    width: 100%;
  }
  .slide-img img {
    width: 100%;
    position: absolute;
    top: 0;
  }
  .slide-pages {
    position: absolute;
    bottom: 10px;
    right: 15px;
  }
  .slide-pages li {
    display: inline-block;
    padding: 0 10px;
    cursor: pointer;
    color: #fff;
  }
  .slide-pages li .on {
    text-decoration: underline;
  }
  .slide-pages .active a{
    color:red;
  }
</style>
